Hmm for the theme, how do we find out about it? o.0
Is the theme = the daily element praised or we have to guess the theme ourselves based on the daily rewards from m-clay? :3

Oh, there are so many cute rewards this time, plus the m-clay is still 49 AP xD

You'll need to use your skills in deduction to determine the theme based on the rare items. For example... looking at the rare items for Monday (pictured in this thread) you can see an overarching pattern